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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Korean Society of Civil Engeneers
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Volume & Issues
Volume 24, Issue 6D - Nov 2004
Volume 24, Issue 6C - Nov 2004
Volume 24, Issue 6B - Nov 2004
Volume 24, Issue 6A - Nov 2004
Volume 24, Issue 5D - Sep 2004
Volume 24, Issue 5C - Sep 2004
Volume 24, Issue 5B - Sep 2004
Volume 24, Issue 5A - Sep 2004
Volume 24, Issue 4D - Jul 2004
Volume 24, Issue 4C - Jul 2004
Volume 24, Issue 4B - Jul 2004
Volume 24, Issue 4A - Jul 2004
Volume 24, Issue 3D - May 2004
Volume 24, Issue 3C - May 2004
Volume 24, Issue 3B - May 2004
Volume 24, Issue 3A - May 2004
Volume 24, Issue 2D - Mar 2004
Volume 24, Issue 2C - Mar 2004
Volume 24, Issue 2B - Mar 2004
Volume 24, Issue 2A - Mar 2004
Volume 24, Issue 1D - Jan 2004
Volume 24, Issue 1C - Jan 2004
Volume 24, Issue 1B - Jan 2004
Volume 24, Issue 1A - Jan 2004
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Finite Element Analysis of River Flow Using SU/PG Scheme -I. Theory and Stability Analysis-
Han, Kun-Yeun ; Baek, Chang-Hyun ; Park, Kyung-Ok ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 183~192
The objective of this study is to develop a hydrodynamic model in a river by the SU/PG (Streamline Upwind/Petrov-Galerkin) scheme. A linear stability analysis is used to examine the amplification and phase characteristics of SU/PG based on this study for the linearized Saint Venant equations. Also, the finite element schemes such as BG (Bubnov-Galerkin), TG (Talyor-Galerkin), PG (Petrov-Galerkin) are used for the comparison of this scheme because of its underlying consistency and generality. Their results show the selective damping of short wave lengths and excellent phase accuracies achieved by the SU/PG method. Whereas the BG and TG schemes display less selective damping and poor phase accuracies, and BG scheme shows non-dissipative feature which causes a divergence problem in short wave length. Also, the SU/PG scheme displays slightly more damping and marginally improved phase accuracy in comparison with the PG method at a shorter wavelength. Therefore, the SU/PG scheme can be effectively applied to a wide variety of practical flow problems.
Finite Element Analysis of River Flow Using SU/PG Scheme -II. Applications-
Han, Kun-Yeun ; Park, Kyung-Ok ; Baek, Chang-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 193~199
The objective of this study is to investigate application capability of the SU/PG (Streamline Upwind/Petrov-Galerkin) scheme through the comparison by model evaluation for various numerical method to develop hydrodynamic model in a river by SU/PG scheme. The model is applied to transition from a mild to a steep channel, nonlinear disturbance propagation in frictionless horizontal channel and dam-break analysis and is compared with the results from BG, TG, PG scheme. The SU/PG method results in the best approximation property by efficient dissipation. One Contribution of this study is to present that results can lead to significant gain in analyzing the accurate flow behavior associated with hydraulic structure as weir and water intake station. And this approach allows to establish a practical management system to secure water resources.
Development and Application of Drought Management System for Geum River Basin
Jeong, Sang-Man ; Ryu, Jae-Hyeon ; Lee, Joo-Heon ; Palmer, R.N. ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 201~208
Recently Korea has been experienced water shortage frequently due to drought. It is imperative that drought management plan be immediately developed not only to optimize existing water resources facility against drought but to get water conflict resolution caused by water shortage. This research focus on the development of drought management system for Geum River basin which include the effective water resource management system as well as conjunctive Dam operation for Daechong and Yongdam Dam using the shared vision modeling under the STELLA environment. In addition, this research presents how to define regional drought and how to manage the Geum River drought management system as encourage people to participate the drought response plan which was developed in this study. The applied results of developed system shows good agreement in defining and estimating the levels of drought with historical data also the system can afford drought early warning for preparedness of expected drought. Moreover the drought management system can produce the various drought management plan for basin by simulation results of the system.
A Study on Peak Flow Prediction by Fuzzy-Neural Network
Lee, Jong-Kyu ; Kim, Hyung-Jun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 209~219
In this study, to predict peak flow in stream due to rainfall, a fuzzy- neural network has been constructed as a hydrological blackbox that examine hydrological process. To construct peak flow prediction system, the fuzzy logical multi-layer perceptron (FLMLP) is selected as a fuzzy-neural network. Input patterns are organized with fuzzy membership function which are Gaussian,
, and triangular function. The FLMLP is constructed by organizing input and output patterns with the observed rainfall and runoff data in Sulma Stream, Paju-city in Gyunggi-do, Korea, taking the rainfall and runoff data as the input pattern and runoff data as the output pattern. Two rainfall-runoff events are simulated by FLMLP and conceptual hydrological models such as an Clark, Snyder, SCS and Nash model. It is concluded that the results predicted by the FLMLP model show a better agreement than those obtained by other models.
Water Quality Management using Real-time Monitoring Data
Ahn, Sang-Jin ; Yeon, In-Sung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 221~228
Water quality study was performed at Pyeongchang river, Dalchun, Yeoju real-time monitoring site in Namhan river. It was investigated the change characteristic of water quality in rainy day and forecasted using neural network and neuro-fuzzy model. As a result, the TOC (Total Organic Carbon) data of rainy day has correlation with discharge and shows high values of mean, maximum, standard deviation. The proposed LM (Levenberg-Marquardt) and MD (Modular) neural network model have a ability of application to the water quality data. And MD model has created the lowest estimation error. Neuro-fuzzy model was simulated TOC variation well on Pyeongchang river and Dalchun site but showed poor ability in Yeoju site. The multi-perceptron warning system model is joined with MD neural network model to pollution control. It is convinced that multi-perceptron can be reasonable judgement of the noized water pollution data.
Derivation of Flood Frequency Curve Using Uncertainty Analysis of Single Event Rainfall-Runoff Model -Uncertainty Analysis of Rainfall-Runoff Model-
Kwon, Hyun-Han ; Park, Dae-Hyeong ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 229~239
The reliability of rainfall-runoff model mainly depends on model parameters. However, the calibrated parameters are estimated differently at the each rainfall event. This is why results from different antecedent moisture condition (AMC), rainfall pattern, and so on. At this study, model input parameters are calibrated from the historical rainfall and flow data. The distributions with lower and upper bounds are assumed to present the variation of calibrated parameters. This study examined the uncertainty of event rainfall runoff model, HEC-1, caused by model calibration parameters. Three methods, Simple Random Sampling (SRS), Random Latin Hypercube Sampling (RLHS), and Center Latin Hypercube Sampling (CLHS) are applied to Soyang-river watershed. Each method presents a good ability of uncertainty analysis. Particularly the RLHS and CLHS presented here are shown to be competitive for a small simulation number with MCS.
Derivation of Flood Frequency Curve Using Uncertainty Analysis of Single Event Rainfall-Runoff Model -Derivation of Flood Frequency Curve-
Kwon, Hyun-Han ; Park, Dae-Hyeong ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 241~246
To overcome problems in estimating design flood using frequency analysis in ungaged watershed, a derived flood frequency curve based on uncertainty analysis is proposed for the estimation of design flood. In order to the derive frequency curve, rainfall generation and HEC-1 rainfall-runoff models are used. Many hydrographs are simulated by Monte Carlo simulation based on Center Latin Hypercube sampling techniques and compared to flood frequency using point frequency analysis. The proposed approach thus shows satisfied results compared with the fitted Log-Normal theoretical probability distribution and 95% Log-Normal confidence interval. The overall results show that the performance of the simulated flood flows are quite comparable to the observed flows.
Characteristics of Local Scour under the Pipelines on the Seabed in Waves
Oh, Hyoun-Sik ; Kim, Kyoung-Ho ; Park, Jae-Sung ; Lee, Ho-Jin ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 247~257
Submarine pipelines are very convenient means to transport oil, gas, water and waste water along the sea bed, so they are widely used in coastal structure. When a pipeline is placed on an erodible bed, scour will develop, causing failure of the pipeline. In order to confirm that pipelines are stable and functional for their projects period, we must give attention to their coastal process. The scour phase is one of the most important subjects when we set up the pipelines in submarine. This paper presents experimental investigations of scour depths with period(T), pipe diameter(D), local wave heights(H) for the horizontal bed and 1/10 sloping bed cases. Based on the obtained data for each live bed condition, This study suggested equilibrium scour depths with relation to KC number and modified Ursell number. In both cases of the horizontal and sloping bed, scour patterns which are different from general scour phases were observed. This phenomenon was explained by the embedment ratio(e/D), namely displacement of seabed's bottom levels by variation of distributed flow field around pipelines.
Necessities of the Simulation of Tidal Flats in Hydrodynamic Numerical Models
Kang, Ju-Whan ; Moon, Seung-Rok ; Park, Seon-Jung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 259~265
For the purpose of evaluating numerical effects of the tidal flat, Mike 21 model is applied at four sites having vast tidal flats. Various numerical experiments have conducted to clarify the effects of tidal flats on hydrodynamics which include the effects on tidal current, tidal amplitude, tidal asymmetry and resonance mode of the estuary. Each of these tidal flat effects is focused at four sites respectively; tidal current at Wando, tidal amplitude at Mokpo coastal zone, tidal asymmetry at Chungkye Bay where shows pronounced ebb dominance, and tidal resonance mode at an imaginary estuary. The results of these numerical experiments show that each effect is unique and prominent at that site, and thus the simulation of tidal flat is considered to be essential at those coasts.
A Stochastic Optimization Model for Sewer Rehabilitation Policy : Considering Uncertainty in Inflow/Infiltration Flow
Ryeo, Min-Kuk ; Kim, Sheung-Kown ; Kim, Jae-Hee ; Kim, Joong-Hun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 267~272
The goal of the sewer rehabilitation planning is to find an optimal policy that would minimize the total expected cost within a specified budget with the least amount of Infiltration and Inflow (I/I). The planning is however, complicated by uncertain effects of actions such as repair/replace/rehabilitation. In order to consider the uncertainty of I/I flow in the sewer rehabilitation problem, we present a Markov Decision Process (MDP) model, allowing uncertain effects of actions, which is a stochastic optimization model. The components of the MDP model is defined as follows: i) state is identified as the amount of I/I flow, ii) actions are classified as 'keep' and 'replace', iii) cost is defined as the expected cost associated with actions, iv) transition probabilities are derived from transition frequency between each state. Using the MDP model, we can develop sewer rehabilitation strategy for a drainage area of Seoul Metropolitan City.
The Effects of Dry Weather I/I Removal on the CSOs Pollution Load Reduction
Lee, Doo-Jin ; Yoon, Hyun-Sik ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3B, 2004, Pages 273~280
The characteristics of dry weather infiltration/inflow (I/I) and its effects on combined sewer overflows (CSOs) in a dense urban area were evaluated. If I/I were reduced within allowance range after sewer rehabilitation, the occurrence frequency and pollution load of CSOs would be reduced to a certain level. The simulation using stormwater management model (SWMM) showed that the removal of I/I below 5% of the average dry weather flow resulted in reducing the number of 5 occurrences and simultaneously intercepting 13.l% of the total yearly CSOs discharge volume. Furthermore, it was simulated that COD and SS load could be reduced by 14.9% and 20.4%, respectively, as the capacity of intercepting sewer were increased.